Image forming apparatus constructed to have a high heat radiating efficiency

Abstract

An image forming portion is arranged below a photosignal scanning portion. An original reading portion is arranged in the horizontal direction of the photosignal scanning portion. A fixing portion is arranged between the photosignal scanning portion and the original reading portion. A radiation duct having a recording paper ejecting portion is arranged above the fixing portion. Thus, an influence by the heat of the fixing portion on the photosignal scanning portion and image reading portion is eliminated. A second recording paper ejecting portion is provided below the original reading portion. By the selection of the second recording paper ejecting portion and the recording paper ejecting portion, the face-up paper ejection and the face-down paper ejection can be selected.

What is claimed is: 
     
       1. An image forming apparatus comprising: an image reading portion for conveying an original and reading image information;   a photosignal scanning portion for generating a photosignal on the basis of an image signal, said photosignal scanning portion being arranged in a horizontal direction of said image reading portion;   an image forming portion for forming a toner image onto a photosensitive drum by being irradiated with said photosignal and transferring said toner image onto a recording sheet, said image forming portion being arranged below said photosignal scanning portion; and   a fixing portion for heating and fixing the toner image transferred onto said recording sheet, said fixing portion being arranged between said photosignal scanning portion and said image reading portion.   
     
     
       2. An apparatus according to claim 1, further including a radiation duct for radiating a heat of said fixing portion,   and wherein said radiation duct is arranged between said photosignal scanning portion and said image reading portion.   
     
     
       3. An apparatus according to claim 1, further having a recording sheet ejecting portion to which the recording sheet from said fixing portion is ejected,   and wherein said recording sheet ejecting portion is provided above said fixing portion.   
     
     
       4. An apparatus according to claim 3, further having an original holding base plate on which originals which are conveyed to said image reading portion are put,   and wherein said original holding base plate is provided above said recording sheet ejecting portion.   
     
     
       5. An apparatus according to claim 3, further including another recording sheet ejecting portion to which the recording sheet from said fixing portion is ejected,   and wherein said another recording sheet ejecting portion is provided so that said image reading portion is interposed by sandwiching between said another recording sheet ejecting portion and said recording sheet ejecting portion.   
     
     
       6. An image forming apparatus comprising: an apparatus main body;   a reading portion for reading an original, said reading portion being arranged on one end side of an upper portion of said apparatus main body;   a photosignal scanning portion for generating a photosignal on the basis of an image signal, said photosignal scanning portion being arranged on the other end side of the upper portion of said apparatus main body;   an image forming portion for forming a toner image onto a photosensitive drum by being irradiated with said photosignal and transferring said toner image onto a recording sheet, said image forming portion being arranged below said photosignal scanning portion of said apparatus main body;   a fixing portion for heating and fixing the toner image transferred to said recording sheet, said fixing portion being arranged in an almost center portion of said apparatus main body; and   a radiation duct for radiating heat of said fixing portion, said radiation duct being arranged between said photosignal scanning portion and said reading portion.   
     
     
       7. An image forming apparatus comprising: an apparatus main body;   a reading portion for conveying an original and reading, said reading portion being arranged on one end side of an upper portion of said apparatus main body;   a photosignal scanning portion for generating a photosignal on the basis of an image signal, said photosignal scanning portion being arranged on the other end side of the upper portion of said apparatus main body;   an image forming portion for forming a toner image onto a photosensitive drum by being irradiated with said photosignal and transferring said toner image onto a recording sheet which is conveyed, said image forming portion being arranged below said photosignal scanning portion of said apparatus main body;   a fixing portion for heating and fixing said toner image transferred onto said recording sheet, said fixing portion being arranged in an almost center portion of said apparatus main body;   a first recording sheet ejecting portion to which the recording sheet from said fixing portion is ejected; and   a second recording sheet ejecting portion to which the recording sheet from said fixing portion is ejected, said second recording sheet ejecting portion being provided so that said reading portion is interposed between said second recording sheet ejecting portion and said first recording sheet ejecting portion.   
     
     
       8. An apparatus according to claim 7, wherein said first recording sheet ejecting portion is positioned above said fixing portion and said second recording sheet ejecting portion is positioned in the horizontal direction of said fixing portion. 
     
     
       9. An apparatus according to claim 8, wherein said first recording sheet ejecting portion relates to a face-down paper ejection and said second recording sheet ejecting portion relates to a face-up paper ejection. 
     
     
       10. An apparatus according to claim 8, further including a switching member for selecting so that the recording sheet from said fixing portion is ejected to either one of said first recording sheet ejecting portion and said second recording sheet ejecting portion.